How strong does a chook shed need to be?

[Moondog55]

So I need to do this soon.
Watching gardening Australia on the ABC a while back I was intrigued by the use of a mesh floor with poo traps underneath and want to build something like that.
But I want it to be free standing and movable.
MetalCorp have strong gal mesh 50*50*4mm at $66- a sheet 1200 * 2000mm so that is the size I want to build to house a dozen or more hens.
As usual money is tight and getting tighter so I want to use as little structural timber as I can and use some of my leftover steel battens to hold the steel sheet cladding and the roof.
I'm hoping I can just use 70*35 H3 for the basic studs and rafters
Advice requested and thanking you all in advance

[Uncle Bob]

Wouldn't need to be too strong, but you wouldn't want it to blow away either.

[ErrolFlynn]

It needs to be strong enough to keep a fox from getting in.

[Moondog55]

It needs to be strong enough to keep a fox from getting in.

Yes I had thought about that, I guess I also need to think about rat proofing and insulation

[Moondog55]

High high can foxes jump?
Over the last month I have been fencing off the yard behind the shed for vegetable garden and chook run. Next doors refuse to fix the fence so I'll be doing something from our side to 3 metres tall and soon I'll be buying a roll of chicken wire to do the upper part of the timber fence etc
Everytime I go to Bunnings I try and get a few of the H3 packers that come under the plinth board packs; I want to use those as part of the chook shed if I can.
Edit
Also I will do a 300mm wide and deep barrier under the chicken safety area to stop the foxes digging under

[ErrolFlynn]

High high can foxes jump?

Not sure, but they are enterprising creatures.

I had chooks once. I used angle iron to make a frame for the coop. About a third of it was enclosed - their bedroom. The roof hinged up for access. The other two-thirds was enclosed in chicken wire. It had no floor so that it could be moved and the chooks could get fresh grass whenever the thing was moved. It had a door at the end so that they could be allowed to walk around the garden. They knew where they lived and they always went to bed at sunset. Kind of funny to see it happening.

After a time, I felt the enclosure was too restrictive. Sometimes on lazy mornings, they wouldn't get let out till late, which wasn't so nice. So, I had a fence put up that surrounded a suitably sized area. The sort of steel 'pailings' you often see around the perimeter of schools. That was on two sides and chicken wire on the other two sides. Probably around but not quite 2 meters high. I had them make the fence panels with a particularly narrow opening to prevent anything from getting in or out.

We generally always shut the door of their pen at the end of the day, but sometimes we forgot. Anyway, they were inside the fenced area. Should be safe. And they generally were. Until one morning we went down there to let them out and the place was a mess. Dead chooks everywhere. The gate was still shut. There were no holes dug under the fence. I doubt a fox could have squeezed through between the pailing. Must have climbed the chicken wire. Maybe climbed a tree and leapt to get in, and then to get out maybe got on top of the coop and leapt to the fence to escape. No idea.

Never had any more after that experience.

[Moondog55]

Then maybe I'll do an angled floppy top too. I was going to try and get a 3m mesh fence all around but it starts to get very expensive.
I will make sure that the coop is fox proof though.